CODEWITHSUNDEEP
android
user946414
user946414

Reputation: 135

How to get all IP address of systems connected to same Wi-Fi network in android

Can someone tell me how to find the IP addrss of all the systems connected to same network in Android programatically. DHCPInfo class gives only the ipaddress assigned to our android device but not for the other devices connected to the same network. How to get ipaddress of other devices connected to same network?

Upvotes: 3

Views: 14109

Answers (2)

keshav
keshav

Reputation: 3255

First get the host ip by this 

public String   s_dns1 ;
   public String   s_dns2;     
   public String   s_gateway;  
   public String   s_ipAddress;    
   public String   s_leaseDuration;    
   public String   s_netmask;  
   public String   s_serverAddress;
   TextView info;
   DhcpInfo d;
   WifiManager wifii;

    wifii = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        d = wifii.getDhcpInfo();

        s_dns1 = "DNS 1: " + String.valueOf(d.dns1);
        s_dns2 = "DNS 2: " + String.valueOf(d.dns2);
        s_gateway = "Default Gateway: " + String.valueOf(d.gateway);
        s_ipAddress = "IP Address: " + String.valueOf(d.ipAddress);
        s_leaseDuration = "Lease Time: " + String.valueOf(d.leaseDuration);
        s_netmask = "Subnet Mask: " + String.valueOf(d.netmask);
        s_serverAddress = "Server IP: " + String.valueOf(d.serverAddress);

d.dns1 is host ip

Now get connected ips by this 

String connections = "";
        InetAddress host;
        try
        {
            host = InetAddress.getByName(intToIp(d.dns1));
            byte[] ip = host.getAddress();

            for(int i = 1; i <= 254; i++)
            {
                ip[3] = (byte) i;
                InetAddress address = InetAddress.getByAddress(ip);
                if(address.isReachable(100))
                {
                    System.out.println(address + " machine is turned on and can be pinged");
                    connections+= address+"\n";
                }
                else if(!address.getHostAddress().equals(address.getHostName()))
                {
                    System.out.println(address + " machine is known in a DNS lookup");
                }

            }
        }
        catch(UnknownHostException e1)
        {
            e1.printStackTrace();
        }
        catch(IOException e)
        {
            e.printStackTrace();
        }
       System.out.println(connections);

intToIp

public String intToIp(int i) {
        return (i & 0xFF) + "." +
                ((i >> 8 ) & 0xFF) + "." +
                ((i >> 16) & 0xFF) + "." +
                ((i >> 24) & 0xFF);
    }

Upvotes: 5

Sunil Kumar
Sunil Kumar

Reputation: 7092

private class Task extends AsyncTask<void void="">{

     InetAddress[] inetAddress = null;
     List<string> hostList = new ArrayList<string>();

  @Override
  protected Void doInBackground(Void... arg0) {

   doTest();
  }


  @Override
  protected void onPostExecute(Void result) {

    ArrayAdapter<string> adapter
    = new ArrayAdapter<string>(
      AndroidInetActivity.this,
      android.R.layout.simple_list_item_1,
      hostList);

    resultList.setAdapter(adapter);
   }

  private void doTest(){

      String host = hostinput.getText().toString();
    inetAddress = InetAddress.getAllByName(host);

    for(int i = 0; i < inetAddress.length; i++){

     hostList.add(inetAddress[i].getClass() + " -\n"
       + inetAddress[i].getHostName() + "\n"
       + inetAddress[i].getHostAddress());
       }

     }
    }
}

Upvotes: -1

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